exam Maths Puzzle Numerical Ability

Solve 2x (x +3) = x + 25

x=5/2 and x=5 is this answer correct.

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exam Other Question

Simplify: -(-(-33)). Been trying to verify this identity:

cot(x) / 1 + sin(x) = csc(x) * sec(x) - sec(x)

Any pointers would be appreciated.